THINK++ — Engineering Visualized

Program Scope

Global Variables

Variables declared outside of any function or block. They are accessible from any part of the program and persist throughout its entire execution.

EXAMPLE

int count = 0; // Global variable

void increment() {
    count++;
}

int main() {
    increment();
    cout << count; // 1
}

AUTO INITIALIZATION

Global variables are automatically initialized to 0 (for numeric types) if not explicitly initialized.

CAUTION

Excessive use of global variables makes code hard to debug and maintain. Prefer local variables and parameters.

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